Few days back, i had posted about Diagnostics and R12.
Basically, i had cribbed about the fact that a lot of Diagnostics tests are yet to be ported in R12. Well, the latest Diag patch has the answers. It provides all of them that you get to see in 11i and more.

As usual, make sure that you have IZU installed and registered (via patch 3636980). Apply the baseline patch (4630372) and also the latest Diag patch for Jul’07 (6044942)

Here is the list of applications and registered tests i see after this Diag patch. Thats quite a few, ain’t it?